Hello,
I am seeing this error message: WARNING: Visual C++ 2015 toolchain does not appear to be correctly installed. Please verify that “Common Tools for Visual C++ 2015” was selected when installing Visual Studio 2015.
Please ensure that you have the C++ content installed for Visual Studio 2015.
Here is a couple of articles that detail how to do this:
https://msdn.microsoft.com/en-us/library/60k1461a.aspx
After you have done this, if you are still getting errors, please post the new output log.
Have a great day